Controller for dental engines



Jun 17, 1930. v 4 H. E WEBER 1,763,995

CONTROLLER FOR DENTAL ENGINES Filed May 26, 1927 2 Sheets-Sheet l i UIIIIII/III Weber 16v TM June 17, 1930. H E, WEBER '1,763,995

CONTROLLER FOR DENTAL ENGINES Filed May 26, 1927 2 Sheets-Sheet 2 Patented June 17, 1930 UNITED STATES HENRY E. WEBER, OF CANTON, OHIOA CONTROLLER FOR Application filed May 26,

This invention relates to controllers for dental engines; and the object of the improvement is to provide means whereby the controller may be held in position to operate the engine at any desired speed, either forward or reverse, said means being so arranged that it may be rendered inoperative when it is desired to manually hold the controller in the desired position.

The above and other objects may be attained by constructing the controller in the manner illustrated in the accompanying drawings, in which Figure l is a side elevation of the improved controller;

Fig. 2, a side elevation of the same, taken substantially at right angles to Fig. l;

Fig. 3, a top plan view of the controller;

Fig. 4, a bottom plan view with the base plate removed; and

Fig. 5, an enlarged sectional view of one end of the operating lever.

Similar numerals refer to similar parts throughout the drawings.

The controller mechanism is located within a cylindric casing 1 mounted upon the base plate 2 and spaced therefrom as by the lugs 3 which may be formed integral with the base plate. The base plate may be provided with the plates 4 for resting upon the floor.

The cable 5 leads from the controller mechanism to the dental engine, and a handle 6 may be provided upon the cover 7 of the casing for moving the controller to any desired location.

i The lever 8 is connected at its center to the controller shaft 9 and located between the base plate and the cylindric casing 1, the ends thereof extending outward beyond the cylindric casing and being provided with the enlarged foot engaging portions 10.

As shown in Fig. 4, a roller 11 may be mounted upon the lever 8,-at one side of its pivotal point for engagement with the fingers 12 which are pivoted to the under side of the cylindric casing as at 13 and normally urged toward each other by the spring 14.

Each of the enlarged ends l0 of the lever is provided with the cylindric portion 15.

A cylindric bearing block 16 is slidably DENTAL ENGINES.

1927. serial No. 194,359.

mounted in the inner end portion of the bore 17 of said cylindric portion 15, and has journaled therein a roller 18. i

This roller is arranged to bel normally held in engagement with the peripheral surface of the cylindric casing 1 by means of a plunger 19, slidably mounted in the bore 17 and provided with the hollow outer end portion 2() which receives the co-il spring 21, the outer end of which is received in the hollow screw 22 whereby the plunger 19 is normally pressed' against the bearing block 16.`

For the purpose of withholding the pressure of the plunger 19 from the bearing block 16, a stud 23 is carried by the plunger and eX'- 65 tended through the longitudinal slot 24 in the upper surface of the cylindric yportion 15 and provided with a head 25 preferably knurled as shown so that the vsame may be easily'operated by the foot.

This slot 24 is provided with the transverse portion 2,7 at its outer end, adapted to receive the stud 23 when the same is pulled backward and rocked into said transverse portion' of the slot as shown in Figs. 2 and '5. y 75 A series of rounded sockets 28 is provided in the peripheral surface of the cylindric casing'l adjacent to each of theend portions 10 of theoperatinglever and adapted to be engaged by the" rollers 18 when'the plunger is 8U in the normal position.

' Normally the' lever is held in the full line position shown the drawings. 'Whenthis lever pushed into the dotted position shown at 1'5FL ,in Fig. 3, the dental engine will be 85 operated in 'forward rotation at the highestl speed, and thev speed will be decreased proportionately at any position between vthat shownjat' 15a and the normal position of the lever shown in full lines. 90 1f the plunger upon the right yside end of the lever is in normal position', it will be seen tliat the roller 118'` carried thereby will engage with the adjacent sockets -28 in the cylindric casing of the controller and the lever may thus be held in any desiredposition. i If itis desired to voperate the dental engine in reverse, the leverV 15 is moved to the dotted line position 15b shown in Fig. 3. The reverse speed of the dental engine will, of leu from, the lever wllimmediately assume the course, be proportionately increased orv decreased by locating the lever at intermediate positions between 15b and that shown at 15 in full lines in Fig. 3.

If the plunger in the left side end of the lever'15 is in the normal position, it will be seen that the roller 18 carried thereby will engage with the adjacent sockets or notches 28 in the cylindrc controller casing. Thus by moving the lever with the toe to any desired position the dental engine may be operated at the desired speed forwardor reverse, the lever remaining in the adjusted position until released.

If it is desired lto operate the controller by holding vthe lever in the desired position by the foot of the operator, the studs 23 may be moved into the transverse portions 27 of the slots 24,*thus holding the plungers 19 withdrawn, as best shown in Fig.`5, whereby the rollers 18 will not be pressed into engagement with the vsockets or notches 28 and the lever may be freely moved to any point be# tween the positions 15a and 15b shown in Fig. 8, and as soon as the foot is removed therenormal positionshown at 15 in said ligure, being controlled by the spring pulled lingers 12 shown-in Fig. 4. 1 4

I claim:

1. In a controller for a dental engine including `a cylindrc casing, an operating lever pivotally mounted concentrically of the casing at one end of the casing, the ends of the lever extending outward beyond the casing, enlarged foot engaging portions extending from each end of the lever adjacent the outer surface of the casing, a plurality of series of diametrically disposed spaced sockets in the outer surface of the casing, and means carried by each foot portion for selective engagement with certain of said diametrically disposed sockets. c

k2.v In a` controller for a dental engine including a cylindrc casing, an operating lever pivotally mounted concentrically of the casing at lone end of the casing, the ends of the lever vextending outward beyond the casing, enlarged foot engaging portions extending from each end of the lever adjacent the outer surface of the casing, a plurality of series of diametrically disposed spaced sockets in the outer surface of the casing, and spring pressed means carried by each foot portion for selective engagement with certainof said diametrcally disposed sockets.

3. In a controller for a dentalen-gine including a cylindrc casing, an operatinglever pivotallyV mounted concentrically ofthe casing at one end of the casing, the ends of the lever extending outward beyond the casing, enlarged foot engaging portions extending from each end of the lever adjacent the outer sockets inthe outer surface of the casing, and rollers carried by each foot portion for selective engagement with certain of said diametrically disposed rounded sockets.

4.V In a controller for a dental engine including a cylindrc casing, an operating lever pivotally mounted concentrically of the casing at one end of the casing, the ends of the lever extending outward beyond the casing, enlarged foot engaging. portions extending from each end of the lever adjacent the outer surface of the casing, a plurality of series of diametrically disposed spaced rounded sockets in the outer surface of the casing, and spring pressed rollers carried by each foot portion yfor selective engagement with certain of'said diametrically disposed rounded sockets'.V y.

5. In a vcontroller for .a dental engine including a cylindrc casing, an operating lever pivotally mounted concentricallyofthe casing at one end of thecasing, the ends of the lever extending outward beyond the casing, enlarged foot engaging 'portions extending from each end of the lever adjacent the outer surface of the casing, a plurality of series ofV diametrically disposed spaced sockets in the outersurface of the casing, means normally maintaining the lever `in a predetermined diametric position relative to the casmg, means carried by each foot portion for selective engagement with certain of said dit ametrically disposed sockets for holding the lever in other diametric positions opposed to the action of said last mentioned means, and means rendering the foot portion means in operative.A

In testimony that I claim the above, I'have hereunto subscribed my name.

` HENRY E. WEBER.

j11el surface of the casing, a plurality of series Y of diametrically disposed spaced rounded 

